Intermediate Bearded Iris (Iris 'Osis') in the Irises Database

Common names:
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Data specific to Irises (Edit)
Hybridizer: Amos Perry
Year Of Registration: introduced prior to registration system
Year Of Introduction (May Differ From Registry): before 1902
Classification: Intermediate Bearded (IB)
Bloom Season: Mid

General Plant Information (Edit)
Life cycle: Perennial
Sun Requirements: Full Sun to Partial Shade
Soil pH Preferences: Slightly acid (6.1 – 6.5)
Neutral (6.6 – 7.3)
Slightly alkaline (7.4 – 7.8)
Minimum cold hardiness: Zone 3 -40 °C (-40 °F) to -37.2 °C (-35)
Maximum recommended zone: Zone 8b
Flowers: Showy
Underground structures: Rhizome
Propagation: Seeds: Will not come true from seed
Propagation: Other methods: Division

The Top 50 Most Popular Spring Blooming BulbsThe Top 50 Most Popular Spring Blooming Bulbs
March 28, 2015

We made it! Winter is over and it's springtime! Let's celebrate with a special week dedicated to these beautiful bulbs that brighten our gardens every spring, and we open that week with a look at the most popular of these plants.

(Full article3 comments)
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Discussion Threads about this plant
Thread Title Last Reply Replies
Bonnie's Bloomers a.k.a. Fellowship of the Garden by grannysgarden Oct 14, 2019 10:04 PM 1,392
Active Iris Borers - Help Please! by greenappleagnes Nov 5, 2018 8:28 AM 62
Carolina Show and Tell - 2018 by Lestv Mar 17, 2019 3:34 PM 1,719
"Goners" 2018 by William Oct 19, 2018 6:44 PM 590
What is your weather today in your iris garden? by evelyninthegarden Nov 12, 2019 10:34 AM 2,701
rhizome rot by TomballEd Nov 6, 2017 3:51 PM 9
Utah Iris Season 2017 by Zencat Nov 1, 2017 10:24 AM 521
Iris of the day by gemini_sage Aug 14, 2019 4:31 AM 1,488
"Goners" 2016 by crowrita1 Nov 28, 2016 4:19 PM 1,310
Question for the hybridizers by Polymerous Feb 19, 2019 10:36 PM 404
Bloom Season 2015/2016 by ARUBA1334 May 17, 2017 9:56 PM 1,131
Honoring the ones we have! by Lestv Feb 1, 2016 4:06 PM 2,056
Not blooming by Searie Jul 14, 2015 12:09 PM 10
What did you do in the Iris garden today? by Paul2032 Nov 14, 2019 8:01 PM 17,370
Iris Diseases..... by Paul2032 Mar 19, 2015 9:56 AM 60
Mindless chatter by Muddymitts Nov 14, 2019 10:47 AM 17,972
Very sad news regarding our own Vi (stetchworth) by lovemyhouse Dec 30, 2015 9:00 AM 54
Japanese iris by vanozzi Oct 23, 2018 1:08 PM 469
And they said Iris are easy by hazeleyes Feb 25, 2016 7:06 AM 42
East weather by irisloverdee Feb 10, 2013 2:45 PM 35

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